a16z is an American venture capital firm founded in 2009 by Marc Andreessen and Ben Horowitz. They specialize in seed investments for technology and social media startups. Their business model focuses on supporting entrepreneurs through networking and guidance rather than just providing funding. They seek out ambitious and courageous founders regardless of educational background. While known for internet investments, a16z also backs companies in fields like nutrition, gaming, and drones. Their strengths include experienced leadership and a skilled team, while ongoing threats include high costs and strong competition in the venture capital industry.